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JEE PHYSICS MCQ: CURRENT ELECTRICITY
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Application
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A thermocouple of resistance is connected in series with a galvanometer of resistance. The thermocouple develops an .m.f. of per degree temperature difference between two junctions. When one junction is kept at and the other in a molten metal, the galvanometer reads . The temperature of molten metal, when .m.f. varies linearly with temperature difference, will be
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Correct option: A
Option A () is correct because it is calculated by equating the current through the galvanometer to the current produced by the thermocouple's emf, considering the total resistance of the circuit.
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Statement-2: For most of the resistors, resistance increases with increase in temperature. The reciprocal of resistance is Corresponding to the resistance , which is order of colour coding on carbon resistors? In a meter bridge, the gaps are closed by resistance 2 and 3 ohms. The value of shunt to be added to 3 ohm resistor to shift the balancing point by is
Statement-2: For most of the resistors, resistance increases with increase in temperature. The reciprocal of resistance is Corresponding to the resistance , which is order of colour coding on carbon resistors? In a meter bridge, the gaps are closed by resistance 2 and 3 ohms. The value of shunt to be added to 3 ohm resistor to shift the balancing point by is